JP4582442B2 - Construction method inside the tank - Google Patents

Description

The present invention relates to a construction method inside a water tank , and more particularly, to a construction method inside a water tank suitable for construction inside a large water tank that has been stored (retained).

  Many tanks installed in large-scale water storage (retention) facilities are constructed for the purpose of long-term use, and repair (construction) may be required inside the tank due to deterioration over time due to long-term use. Examples of the large water tank include water tanks used for fire prevention, swimming, chemical storage, and the like. The structure of such a water tank is simply a concrete wall formed into a water tank, and the inner surface of the tank is lined with a stainless steel plate (metal plate) for the purpose of protecting the concrete wall from chemicals or maintaining the quality of the stored water. Examples include pasted ones.

  It is dangerous for an operator to dive in such a water tank for a long time, and there is a problem that work in water has a longer time than work on land. Also, when draining and storing large tanks for repair work, it requires a large amount of money, and tanks that do not require circulation of stored items such as fire prevention tanks are not equipped with drainage facilities, or In some cases, the drainage facility does not work.

  In view of such a situation, Patent Documents 1 and 2 propose an apparatus and a method for repairing (construction) the inside of a water tank. Patent Document 1 proposes an apparatus for repairing a surface layer in a water tank having a structure in which a surface layer (lining) of a stainless steel plate is provided inside a foundation made of concrete. According to it, the repair plate coated with adhesive is held on the manipulator lowered in the water tank, the manipulator is operated by remote operation, the repair plate is pressed and adhered to the repair location, and repair is performed. is there.

Patent Document 2 proposes a repair method in the case where an operator enters the water tank and repairs it. The proposal described in Patent Document 2 is for a sewage layer such as a sewage treatment plant, but is a method of performing local drainage in a water tank. Specifically, the duct is submerged in the bottom of the aquarium to be constructed in the aquarium, a water stop material is provided at the lower opening edge of the duct, and the water accumulated when the duct is submerged is drained from the duct, This is a method of securing an airborne area in a part of the inside.
JP 2003-156586 A JP 2002-61279 A

  According to the repair method using the apparatus described in Patent Document 1, there is no need for an operator to enter the water tank, and the risk associated with the work is low and the work is easy. However, since the repair work is performed remotely, the actual repair location cannot be visually confirmed. Therefore, there is a problem that it cannot be confirmed whether or not the repair has been properly performed.

  Further, according to the construction method described in Patent Document 2, it is considered that the construction method is very useful for construction, repair, etc. in a general water tank. However, when installing a duct as a work space, water in the water tank enters the duct, and the water is drained after the duct is installed. For this reason, in the water tank which stores sewage, a chemical | medical agent, etc., the inside of the duct installed in the water tank will be contaminated, and there exists a problem that work cannot be started immediately after duct installation. In addition, the construction method described in Patent Document 2 has a problem that the construction (repair) location is limited to the bottom of the water tank (low part). Moreover, in the construction method described in Patent Document 2, the gap between the duct and the bottom of the water tank may not be uniform, and the seal structure interposed in the gap and the gap in an optimal state (for example, a nearly uniform state) There is also a demand for a gap adjustment structure for achieving this.

In this invention, it aims at providing the construction method inside a water tank which can ensure the clean air | atmosphere area | region inside a water tank, and can perform repair (construction) inside a water tank .

In order to solve the above-mentioned problems, a construction method inside a water tank according to the present invention is a method for performing construction inside a water tank, and a work room having an opening corresponding to a construction target wall surface inside the water tank is used as the work wall surface. Closely fixed, sealing the bottom of the duct for entering and exiting the work room, while ensuring a clean area in the duct, put a weight in the duct and sink into the water tank, It connects to an entrance / exit, removes the said seal | sticker, discharges | emits the said weight from the inside of the said duct, ensures the air | atmosphere area | region in the said working chamber and the said duct, and performs the construction inside the said water tank, It is characterized by the above-mentioned. That is, the work chamber is closely fixed to a height position corresponding to the height of the construction target wall surface. The construction target wall surface includes the bottom of the aquarium.
In the construction method inside the water tank as described above, the weight is preferably water.
Further, the duct may be divided into a plurality of parts, and it is preferable that the ducts are sequentially added when sinking into the water tank.

  Moreover, as a water leakage prevention seal structure useful for the construction inside the water tank that requires securing the water stop area as described above, the water leak prevention seal structure provided in the water stop area is a first structure that contacts the underwater area side. A water leakage prevention member and a second water leakage prevention member in contact with the air region side, a water stop space is provided between the first water leakage prevention member and the second water leakage prevention member, The water stop space is preferably provided with a groove provided with a water leakage detection means and a drainage means to prevent water leakage to the air region.

Further, in the construction inside the water tank as described above, the opening and the wall surface at least with respect to the upper and lower parts of the structure having an opening that secures a water stop region through a seal structure with respect to the wall surface in water. It is preferable to adopt a gap adjusting structure for a water stop region, which is provided with an adjusting mechanism having a jack means for adjusting the interval of the water stop.
In carrying out the construction method inside the water tank, it is preferable to use a work chamber provided with an edge of the work opening with the water leakage prevention seal structure having the above-described configuration.

  In the construction method inside the aquarium as described above, a work chamber having an opening corresponding to the wall surface to be constructed inside the aquarium is firmly fixed to the work wall surface, and the bottom of the duct for entering and exiting the work chamber is sealed. Stop, and gradually sink into the water tank while placing a weight in the duct while ensuring a clean area in the duct, connect to the entrance and exit of the work chamber, remove the seal, from the duct By discharging the weight and securing an air region in the work chamber and the duct, the inside of the duct is contaminated because water in the water tank does not enter the duct serving as the entrance to the work chamber. Since it can be minimized even if there is contamination, a clean air region can be secured in the water tank. Thereby, work can be started immediately after securing the air region in the water tank. Moreover, there is no possibility of inundation after duct connection by first closely fixing the work room to the construction target wall surface.

  Further, by using water as the weight, the weight can be easily discharged by a pump or the like. Further, the discharged water can be discharged into the water tank or simply drained, and does not require disposal processing or storage, and therefore does not require disposal costs or storage space.

  Moreover, even if it is a water tank which cannot install a large overhead crane etc. by making it possible to divide into a plurality of ducts and adding them sequentially when sinking into the water tank, the water tank as described above Internal construction methods can be adopted.

  Further, in the water leakage prevention seal structure as described above, a first water leakage prevention member in contact with the underwater region side and a second water leakage prevention member in contact with the air region side are provided, and the first water leakage prevention member and the above In addition to the double seal structure, a water stop space is provided between the second water leak prevention member and the water stop space is provided with a groove provided with a water leak detection means and a drain means. A water stop space provided with a water leak detection means and a drain means will be provided, and even if there is water leak from the first water leak prevention member, it becomes possible to detect and drain the water leak in the water stop space, An airborne area can be ensured reliably.

  Further, by adopting the above-described gap adjustment structure of the water stop region, the gap between the structure and the underwater wall surface can be optimally adjusted even when the underwater wall surface has irregularities or inclinations. The effect of the seal provided in the opening can be effectively exhibited.

Hereinafter, an embodiment according to a construction method inside a water tank of the present invention will be described with reference to the drawings. The following embodiment is a partial embodiment of the present invention, and the present invention is not limited to the following embodiment.
FIG. 1 is a view showing a first embodiment according to a construction method inside a water tank of the present invention, and FIG. 2 is a partially enlarged view of a work chamber in FIG.

  In FIG. 1, the reservoir 14 is filled in the water tank 10. Depending on the purpose of use of the tank, the reservoir 14 may be water for a fire prevention tank, water containing chlorine for a swimming pool, sewage for a sewage tank, and various chemicals for a chemical storage tank. In the embodiment described below, the reservoir 14 is described as water or sewage / medicine mainly composed of water. However, the reservoir 14 includes fluid (liquid) other than water.

  In the present embodiment, the work chamber 16 having the opening 18 is closely fixed to the wall surface or bottom surface repair (construction) portion of the water tank 10, and the duct 20 serving as the entrance to the work chamber 16 is connected. The basic structure is to perform a repair (construction) of the aquarium wall surface or the aquarium bottom surface while securing an air region in the structure composed of the working chamber 16 and the duct 20.

  Below, the structure of the working chamber 16 and the duct 20 used for this embodiment is demonstrated concretely. As shown in an enlarged view of FIG. 2, the working chamber 16 is provided with an overhanging space 17 in a part of the duct 20, and an opening 18 corresponding to the wall surface to be repaired is provided in the overhanging space 17. A seal 18 a for preventing water leakage from the water tank (underwater region) is provided at the edge of the opening 18. The seal 18a may have a structure as shown in FIG. That is, the first water leakage preventing member 22 that comes into contact with the underwater region and the second water leakage preventing member that is provided inside the first water leakage preventing member 22 and comes into contact with the air region in the work chamber 16. 24.

  Further, a water stop space is provided between the first water leak prevention member 22 and the second water leak prevention member 24, and the water stop space includes a water leak detection means (not shown), a drainage means (not shown), and the like. It is preferable to provide a groove portion 26 having By adopting such a seal structure, even if the first water leakage preventing member 22 leaks and the stored matter (for example, water) 14 in the water tank 10 is inundated (inflow), the inundation is stopped. And the leaked water can be detected through the groove 26, and the flooded reservoir 14 can be discharged to the outside of the working chamber 16. Therefore, the probability of preventing water leakage in the working chamber 16 can be increased, and repair (construction) in the water tank 10 can be performed with peace of mind. The drainage means may be mechanical means such as a pump, or may be a means that includes a bucket or the like in the work chamber 16 and drains the bucket or the like naturally.

  The first water leakage prevention member 22 and the second water leakage prevention member 24 are inflatable and deflateable hollow members made of an elastic material such as rubber or silicon, and air or the like is supplied by an air supply means or a liquid supply means (not shown). It is preferable to have a structure capable of injecting a fluid such as a gas or a liquid such as water into the internal space. With such a structure, when the working chamber 16 is brought into close contact with the work target wall surface, both of the water leakage preventing members 22 and 24 are expanded to increase the adhesion rate to the work target wall surface, thereby enhancing the water leakage preventing effect. Can do.

  Further, a partition wall 28 made of a flexible material such as urethane is provided on the underwater region side (outside) of the opening 18, and a gel-like shape is formed between the partition wall 28 and the first water leakage prevention member 22. It may be configured to inject a compound 29 (including a curable type) to enhance the water leakage prevention effect (water stop effect).

Further, at the upper part of the working chamber 16, an entrance / exit 19 to the working chamber 16 is provided as a connecting portion with the duct 20 to be described in detail later.
The work chamber 16 fixed to the bottom of the water tank is pressed against the construction target wall surface by jack means 35 provided on the lower fixed beam 34 shown in FIG.

  Next, the configuration of the duct 20 will be described. The duct 20 is configured to be divided into a plurality of parts in the flange portion 20a. The duct 20 that can be divided into a plurality of parts is extended while being sequentially connected when submerged into the water tank 10. Thereby, even in a facility that does not have a large crane, the construction method inside the aquarium of the present invention can be implemented. When connecting, a sealing member such as an O-ring, a seal ring, or packing may be provided between the opposing flange portions 20a to prevent water leakage into the duct 20. Further, the plurality of divided ducts 20 may be connected by fastening means such as bolts / nuts or buckles (not shown). In addition, although the flange part 20a is provided in the outer side of the duct 20 in FIG. 1, you may make it provide inward.

  Further, the duct 20 may be provided with lifting means such as a ladder 20b. By adopting such a configuration, the ladder 20b is provided on the inside of the duct 20 by the length connecting the ducts 20, so that it is not necessary to prepare a ladder corresponding to the length of the duct 20 separately.

  In the duct 20 as described above, the portion protruding from the water tank 10 may be fixed by providing a beam 30 at the edge of the water tank 10. Regarding the fixing of the duct 20, a flange structure 36 may be provided on the flange 20 a of the duct 20, and the flange structure 36 may be fastened and fixed by jack means 37 that can be fastened and fixed.

  The flange structure 36 in the present embodiment is a disc body configured to be bolted or fitted and fixed to the flange portion 20a, and has a hole in the entrance / exit portion of the duct 20. In addition, the flange structure 36 may be formed with a contact plate portion 36a that is bent at the outer peripheral portion. In the present embodiment, the jack means 37 may be structured by a bracket and a push bolt formed at right angles, and may be fixed to the beam 30. Although only one jack means 37 is shown in FIG. 1, the same number of jack means 37 as that of the contact plate portions 36a of the flange structure 36 may be provided.

  The jack means 37 plays a role of fixing the duct 20 to the beam 30 by tightening the contact plate portion 36a with a push bolt, and also presses the opening 18 of the working chamber 16 against the construction target wall surface by adjusting the push bolt. Also works.

  Moreover, the jack means 37 can be adjusted together with the jack means 35 provided on the lower fixed beam 34, so that the installation position of the structure can be relatively adjusted from above and below. It is possible to adjust the space between the wall and the construction target wall surface to an optimum space for interposing the seal, and to enhance the sealing effect in the water stop region.

The work chamber 16 and the duct 20 configured as described above are installed as follows.
When the work chamber 16 and the duct 20 are installed in the water tank 10, first, the lower fixed beam 34 is installed on the bottom surface of the water tank near the construction target wall surface. Installation of the lower fixed beam 34 is performed by an operator dive into the water tank 10 and positioned. The fixing method varies depending on the use and structure of the water tank 10, but for example, a method using a suction cup, an electromagnetic chuck system when the water tank inner surface is covered with a metal lining, and a case where a temporary bolt is provided on the bottom of the water tank. A method such as a bolt fixing method may be used. The lower fixed beam 34 may be suspended in the water tank 10 by a crane.
Moreover, since the water tank wall surface is not necessarily formed in a plane, the lower fixing beam 34 is preferably in a temporarily fixed state in which some movement is possible at the time of positioning by a template 16a (see FIG. 5) described later.

  After the installation of the lower fixed beam 34 is completed, as shown in FIG. 5, a framework (template) 16 a created in accordance with the shape of the work chamber 16 is lifted by the crane 11 via the wire 11 a and is lowered into the water tank 10. The template 16a is temporarily placed in a state in which a portion corresponding to the opening 18 in the work chamber 16 is pressed against the construction target wall surface on the bottom surface of the water tank. Thereafter, the lower fixed beam 34 is fixed in accordance with the installation state of the template 16a. When the fixing of the lower fixed beam 34 is completed, the template 16 a is pulled up by the crane 11.

  Thereafter, as shown in FIG. 6, the work chamber 16 is lifted by the crane 11 via the wire 11 a and is lowered into the water tank 10. At this time, the opening 18 and the entrance / exit 19 may be in an open state, but when the inside of the working chamber 16 is kept clean, the opening 18 and the entrance / exit 19 are provided by a sealing plate (not shown). And the work chamber 16 may be sunk with a weight. Note that the weight may be removed after the working chamber 16 is firmly fixed to the construction target wall surface.

  The positioning operation of the lower fixed beam 34 can be performed by directly sinking the working chamber 16 into the water tank 10 without using the template 16a. However, since the work chamber 16 is a structure having a surface, a large resistance is generated when performing underwater work, and thus there is a problem that the work takes time. Therefore, the template 16a that is a framework as described above. It is recommended to use

  Next, as shown in FIG. 7, the duct 20 a is lifted by the crane 11 through the wire 11 a and is lowered into the water tank 10. At this time, in order to prevent the inside of the duct 20 from being contaminated by the reservoir 14 in the water tank, the lower end portion of the duct 20 is sealed by the sealing plate 20c, and the inside of the duct 20 is used as a weight for suppressing buoyancy. It is advisable to fill with water 21. The sealing plate 20 c can be removed from the inside of the duct 20. Moreover, the filling of the water 21 may be performed by the hose 21a or the like.

  The duct 20 is sunk into the aquarium 10 as described above, and after the duct 20 is submerged to some extent in the aquarium 10, the duct 20 is temporarily placed on the beam 30 and the crane 11 is cut off, as shown in FIG. In this way, a new duct 20 is connected and the water 21 is filled again to sink. The timing at which the duct 20 is connected may be arbitrary, but the reservoir 14 is not mixed into the duct 20.

  The operation of filling the water 21 and connecting the duct 20 is continued until the lower end of the duct 20 reaches the entrance / exit 19 of the working chamber 16. Although not shown, the work may be performed by providing a beam for assisting the connection work of the duct 20 at the edge of the water tank 10.

  When the duct 20 reaches the entrance / exit part 19 of the work chamber 16, the entrance / exit part 19 is connected to the lower end of the duct 20. As a connection method, an operator performs in the water tank 10 following the connection between the ducts 20.

After the connection between the working chamber 16 and the duct 20 is completed, the sealing plate 20c that seals the lower end of the duct 20 is removed. At this time, if the entrance / exit of the working chamber 16 is also sealed, the sealing plate is removed at the same time. The water 21 filled as a weight inside the duct 20 is discharged by a pump (not shown) or the like. At this time, the discharged water 21 can be discharged into the aquarium 10 or discharged out of the facility, so there is no need to dispose of it as an unnecessary material or store it. When the work chamber 16 is installed in a sealed state, the sealing plate provided in the opening 18 is also removed. In this way, an air region is secured in the duct 20 and the work chamber 16.
After securing the air region in the water tank 10 as described above, the construction target wall surface is repaired from the opening 18 of the work chamber 16.

  In the first embodiment, when the duct 20 is sunk into the water tank 10, the inside of the duct 20 is contaminated with the storage 14 in the water tank 10 by being sunk while being filled with water 21 as a weight. Therefore, construction (repair) work can be performed in a clean area, and there is no risk of contamination with chemicals, for example, and work can be started immediately after the duct 20 and the work room 16 are installed. Further, since the water 21 discharged from the duct 20 can be discharged to the water tank 10 or discharged outside the facility, there is no need to dispose of it as an unnecessary material or store it.

  Next, a second embodiment according to the present invention will be described with reference to FIG. This embodiment is basically the same as the first embodiment, but the position where the work chamber 16 is installed is different. That is, in the first embodiment, the work chamber 16 is installed on the bottom surface of the water tank 10 and the bottom surface of the water tank 10 and the water tank wall surface in the vicinity thereof can be constructed (repaired). Using the fact that the duct 20 can be divided into a plurality of parts, the work chamber 16 is installed at a position (depth) corresponding to the wall surface to be constructed.

The installation method of the duct 20 and the work chamber 16 in this embodiment is also substantially the same as that of the first embodiment, but the installation procedure is slightly different, so only the installation flow will be described below.
In the present embodiment, first, the lower fixing beam 34 is temporarily fixed to the bottom of the water tank. The duct 20d is installed on the temporarily fixed lower fixed beam 34. The duct 20d installed directly on the lower fixed beam 34 serves as a pedestal for installing the work chamber 16, and is connected to a length corresponding to the installation position (depth) of the work chamber 16. Moreover, since the operator does not enter the duct 20d serving as a pedestal, it is not necessary to seal the lower end when subsiding into the water tank 10.

  After installing the duct 20d serving as a pedestal, the duct 20d and the lower fixed beam 34 are positioned and fixed at the position where the work chamber 16 is installed using a template, as in the first embodiment. After positioning the duct 20d and the lower fixed beam 34, the work chamber 16 is installed above the duct 20d serving as the pedestal. The process after the work chamber 16 is installed is the same as that in the first embodiment. In the present embodiment, the duct 20d serving as the pedestal of the work chamber 16 is naturally not a duct but may be a frame member such as a steel frame.

In the above embodiment, the water 21 is used as a weight when the duct 20 is sunk into the water tank 10. However, if the specific gravity is larger or the same as that of the reservoir 14 in the water tank 10, other liquids or solids are used. (Metal) etc. may be sufficient. As the weight has a larger specific gravity, a smaller amount is required, so that the weight can be easily taken into and out of the duct 20.
Further, the seal 18a is not limited to double, but may be single or triple. Further, the water leakage preventing member is not limited to a hollow member, and may be formed of an elastic material such as rubber or silicon.

  In the embodiment, the work chamber 16 and the duct 20 are fixed by the vertical support of the lower fixed beam 34 and the beam 30 provided at the edge of the water tank 10. As long as it can be fixed in close contact, it may be supported by either the upper or lower side.

In addition, the duct 20 can be divided into a plurality of parts in the embodiment, but may have a single structure. Furthermore, although the duct 20 has a cylindrical shape in the figure, it may have another shape (for example, a rectangle, a polygon, an ellipse, etc.).
In addition, the basic configuration is that one work chamber 16 is installed for the duct 20, but when the construction target wall surface is separated vertically in the water tank 10, Two or more working chambers 16 may be installed.

  Further, in the work chamber 16 provided with the opening 18 provided with the seal 18a, when the depth of the water tank 10 is deep or there is an obstacle between the construction target wall surface and the water surface, the following method is used. Can also be taken. That is, only the work room 16 is fixed to the construction target wall surface, and the work room 16 is sealed. The inside of the work chamber 16 is pressurized with air or the like, the stored matter 14 in the water tank 10 is discharged from the inside of the work chamber 16, and an air region is secured in the work chamber 16.

The construction method inside the aquarium of the present invention can also be used when performing construction that requires drilling in the aquarium.
In addition, the water leakage prevention seal structure according to the embodiment is particularly useful for an opening when securing an air region in a water tank, but it can be used for various boundary portions that require water stoppage. Is possible.

It is a perspective view which shows 1st Embodiment which concerns on the construction method inside the water tank of this invention. It is a perspective view which shows the elements on larger scale of the working chamber in 1st Embodiment. It is a sectional side view which shows the water leak prevention seal structure which concerns on embodiment . It is a top view which shows the installation process of the bottom part fixed beam in 1st Embodiment. It is a figure which shows the utilization process of the template in 1st Embodiment. It is a figure which shows the installation process of the working chamber in 1st Embodiment. It is a perspective view which shows the sinking process of the duct in 1st Embodiment. In 1st Embodiment, it is a perspective view which shows the process of sinking, connecting a duct. It is a figure which shows 2nd Embodiment which concerns on the construction method inside the water tank of this invention.

Explanation of symbols

10 ......... Water tank, 11 ......... Crane, 14 ......... Storage, 16 ...... Work room, 17 ...... Overhang space, 18 ...... Opening, 18a ......... Seal, 19 ......... Entry / exit part, 20 (20d) ......... Duct, 20a ......... Flange part, 20b ......... Ladder, 20c ......... Sealing plate, 21 ......... Water, 22 ......... First water leakage prevention member, 24 ......... second water leakage prevention member, 26 ......... groove, 28 ......... partition, 29 ......... compound, 30 ......... beam, 34 ......... lower fixed beam, 35 .... jack means.

Claims (3)

  A method for carrying out construction inside the aquarium, wherein a work room having an opening corresponding to a construction target wall surface inside the aquarium is closely fixed to the construction target wall surface, and a bottom portion of a duct for entering and exiting the work room is provided. Seal, secure a clean area in the duct, put a weight in the duct, sink into the water tank, connect to the entrance of the working chamber, remove the seal, remove the weight from the duct A construction method inside the aquarium, wherein the construction is performed inside the aquarium by discharging and securing an air region in the work chamber and the duct.   The construction method for an aquarium according to claim 1, wherein the weight is water.   The construction method for the inside of the aquarium according to claim 1 or 2, wherein the duct is divided into a plurality of parts, and is sequentially added when submerged into the aquarium.

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